@wolf_garcia yes luck midbass is issue, coudn fixed by add active woofer module
because is cover 20-150hz, and you can see gap (if you use any measurement system) up to 700Hz, good designed 3 way conventional
speakers is free from this problem , using crosspoint 500-700hz, and
balanced . To avoid this issue in high sensitivity LS
based on wide range driver like Zu 10" i see only one way to add additional midbass driver to fill this gap , and make is active ( loaded
on separate amp and active crossover) i know is complicated , but
it was made it in my Bache audio-002
http://bacheaudio.com/bache-audio-002ab-loudspeakers-v2-stereotimes-com/